Abstract
Recent developments in imaging non destructive evaluation techniques offer possibilities of quantitative measurement of strain localizations associated with plastic instabilities. Digital image correlation is a technique now being widely employed for studying the temporal strain evolution associated during tensile deformation. This work focuses on the application of digital image correlation to visualise the two dimensional strain evolutions in the weld zone, heat affected zone and the base metal during monotonic uniaxial tensile deformation of friction stir weld samples of copper – stainless steel. The results indicated that the Cu- Stainless steel weld interface exhibited a lower tensile strength compared to the other regions. The experimental observations are discussed in relation with the current theoretical understanding. The experiments also reveal the potential of advanced imaging NDE methods for providing better insights of the micro mechanisms of deformation and failure including local deformation characteristics of the material under study.
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